aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/main/java/com/google/devtools/build/lib/skyframe/WorkspaceFileFunction.java
blob: a82a9a7f389d71aacb9275072098849b4ac7871b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.devtools.build.lib.skyframe;

import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.Package.NameConflictException;
import com.google.devtools.build.lib.packages.PackageFactory;
import com.google.devtools.build.lib.packages.RuleClassProvider;
import com.google.devtools.build.lib.packages.WorkspaceFactory;
import com.google.devtools.build.lib.skyframe.WorkspaceFileValue.WorkspaceFileKey;
import com.google.devtools.build.lib.syntax.BuildFileAST;
import com.google.devtools.build.lib.syntax.Environment.Extension;
import com.google.devtools.build.lib.syntax.Mutability;
import com.google.devtools.build.lib.syntax.SkylarkSemantics;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;

/**
 * A SkyFunction to parse WORKSPACE files.
 */
public class WorkspaceFileFunction implements SkyFunction {

  private final PackageFactory packageFactory;
  private final BlazeDirectories directories;
  private final RuleClassProvider ruleClassProvider;
  private static final PackageIdentifier rootPackage = PackageIdentifier.createInMainRepo("");

  public WorkspaceFileFunction(
      RuleClassProvider ruleClassProvider,
      PackageFactory packageFactory,
      BlazeDirectories directories) {
    this.packageFactory = packageFactory;
    this.directories = directories;
    this.ruleClassProvider = ruleClassProvider;
  }

  @Override
  public SkyValue compute(SkyKey skyKey, Environment env)
      throws WorkspaceFileFunctionException, InterruptedException {

    WorkspaceFileKey key = (WorkspaceFileKey) skyKey.argument();
    RootedPath workspaceRoot = key.getPath();
    WorkspaceASTValue workspaceASTValue = (WorkspaceASTValue) env.getValue(
        WorkspaceASTValue.key(workspaceRoot));
    if (workspaceASTValue == null) {
      return null;
    }
    SkylarkSemantics skylarkSemantics = PrecomputedValue.SKYLARK_SEMANTICS.get(env);
    if (skylarkSemantics == null) {
      return null;
    }

    Path repoWorkspace = workspaceRoot.getRoot().getRelative(workspaceRoot.getRootRelativePath());
    Package.Builder builder = packageFactory.newExternalPackageBuilder(
        repoWorkspace, ruleClassProvider.getRunfilesPrefix());

    if (workspaceASTValue.getASTs().isEmpty()) {
      try {
        return new WorkspaceFileValue(
            builder.build(), // resulting package
            ImmutableMap.<String, Extension>of(), // list of imports
            ImmutableMap.<String, Object>of(), // list of symbol bindings
            workspaceRoot, // Workspace root
            0, // first fragment, idx = 0
            false); // last fragment
      } catch (NoSuchPackageException e) {
        throw new WorkspaceFileFunctionException(e, Transience.TRANSIENT);
      }
    }
    WorkspaceFactory parser;
    try (Mutability mutability = Mutability.create("workspace %s", repoWorkspace)) {
      parser =
          new WorkspaceFactory(
              builder,
              ruleClassProvider,
              packageFactory.getEnvironmentExtensions(),
              mutability,
              key.getIndex() == 0,
              directories.getEmbeddedBinariesRoot(),
              directories.getWorkspace(),
              directories.getLocalJavabase());
      if (key.getIndex() > 0) {
        WorkspaceFileValue prevValue = (WorkspaceFileValue) env.getValue(
            WorkspaceFileValue.key(key.getPath(), key.getIndex() - 1));
        if (prevValue == null) {
          return null;
        }
        if (prevValue.next() == null) {
          return prevValue;
        }
        parser.setParent(prevValue.getPackage(), prevValue.getImportMap(), prevValue.getBindings());
      }
      BuildFileAST ast = workspaceASTValue.getASTs().get(key.getIndex());
      PackageFunction.SkylarkImportResult importResult = PackageFunction.fetchImportsFromBuildFile(
          repoWorkspace, rootPackage, ast, env, null);
      if (importResult == null) {
        return null;
      }
      parser.execute(ast, importResult.importMap, skylarkSemantics);
    } catch (NoSuchPackageException e) {
      throw new WorkspaceFileFunctionException(e, Transience.PERSISTENT);
    } catch (NameConflictException e) {
      throw new WorkspaceFileFunctionException(e, Transience.PERSISTENT);
    }

    try {
      return new WorkspaceFileValue(
          builder.build(),
          parser.getImportMap(),
          parser.getVariableBindings(),
          workspaceRoot,
          key.getIndex(),
          key.getIndex() < workspaceASTValue.getASTs().size() - 1);
    } catch (NoSuchPackageException e) {
      throw new WorkspaceFileFunctionException(e, Transience.TRANSIENT);
    }
  }

  @Override
  public String extractTag(SkyKey skyKey) {
    return null;
  }

  private static final class WorkspaceFileFunctionException extends SkyFunctionException {
    WorkspaceFileFunctionException(NoSuchPackageException e, Transience transience) {
      super(e, transience);
    }

    WorkspaceFileFunctionException(NameConflictException e, Transience transience) {
      super(e, transience);
    }

    WorkspaceFileFunctionException(IOException e, Transience transience) {
      super(e, transience);
    }
  }
}